linux-kernel - Re: platform/i2c busses: pm runtime and system sleep

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Message-ID: <20110218221606.GB25168@sirena.org.uk>
Date:	Fri, 18 Feb 2011 22:16:06 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, khilman@...com,
	magnus.damm@...il.com, LKML <linux-kernel@...r.kernel.org>,
	Rabin Vincent <rabin@....in>, stern@...land.harvard.edu,
	linux-i2c@...r.kernel.org, linux-pm@...ts.linux-foundation.org,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: platform/i2c busses: pm runtime and system sleep

On Fri, Feb 18, 2011 at 08:27:44PM +0000, Russell King - ARM Linux wrote:

> Do we have any pressing need to convert AMBA stuff?  I haven't heard any
> reason yet to convert them to runtime PM - they don't even make any
> runtime PM calls.

There's a bit of a chicken and egg problem in that it's not possible for
devices to make use of runtime PM unless the bus has runtime PM support
implemented - the bus implementation is mandatory, there's no default.
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